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OLED device having improved contrast

Active Publication Date: 2007-04-26
GLOBAL OLED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] The present invention has the advantage that it i

Problems solved by technology

In particular, OLED display devices suffer from problems with contrast since the back electrode of the devices is typically highly reflective.
However, such circular polarizers are expensive.
However, as taught in the prior art such a solution also reduces the brightness of the color emitters and the efficiency of the display is reduced.

Method used

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  • OLED device having improved contrast
  • OLED device having improved contrast
  • OLED device having improved contrast

Examples

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Embodiment Construction

[0025] In accordance with one embodiment of the present invention, a full-color organic light-emitting diode (OLED) device, comprises a plurality of light emitting OLED pixels, each pixel having three or more color light-emitting elements for emitting different colors of light specifying a gamut and at least one additional light-emitting element for emitting a color of light within the gamut and wherein the power efficiency of the additional element is higher than the power efficiency of at least one of the three or more gamut elements; and a patterned neutral density filter selectively filtering the emitted light from the additional light emitting element.

[0026] Referring to FIG. 1, in one embodiment of the present invention, an active-matrix, bottom-emitting OLED device has a transparent substrate 10. Over the substrate 10, a semiconducting layer is formed providing thin-film electronic components 30 for driving an OLED. An interlayer insulating and planarizing layer 32 is formed...

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Abstract

A full-color organic light-emitting diode (OLED) device, comprising: a) a plurality of light emitting OLED pixels, each pixel having three or more color light-emitting elements for emitting different colors of light specifying a gamut and at least one additional light-emitting element for emitting a color of light within the gamut and wherein the power efficiency of the additional element is higher than the power efficiency of at least one of the three or more gamut elements; and b) a patterned neutral density filter selectively filtering the emitted light from the additional light emitting element.

Description

FIELD OF THE INVENTION [0001] The present invention relates to organic light-emitting diode (OLED) devices and, more particularly, to an OLED device having improved light output and contrast. BACKGROUND OF THE INVENTION [0002] Organic light-emitting diode (OLED) devices, also referred to as organic electroluminescent (EL) devices, have numerous well-known advantages over other flat-panel display devices currently in the market place. Among the potential advantages is brightness of light emission, relatively wide viewing angle, reduced device thickness, and reduced electrical power consumption compared to, for example, liquid crystal displays (LCDs) using backlighting. [0003] Applications of OLED devices include active-matrix image displays, passive-matrix image displays, and area-lighting devices such as, for example, selective desktop lighting. Irrespective of the particular OLED device configuration tailored to these broad fields of applications, all OLEDs function on the same gen...

Claims

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Application Information

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IPC IPC(8): H05B33/22H05B33/00
CPCH01L27/3213H01L27/322H01L2251/5315H10K59/351H10K59/38H10K2102/3026
Inventor COK, RONALD S.BOROSON, MICHAEL L.
Owner GLOBAL OLED TECH
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